/***************************************************************************************
* Copyright (c) 2014-2022 Zihao Yu, Nanjing University
*
* NEMU is licensed under Mulan PSL v2.
* You can use this software according to the terms and conditions of the Mulan PSL v2.
* You may obtain a copy of Mulan PSL v2 at:
*          http://license.coscl.org.cn/MulanPSL2
*
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
*
* See the Mulan PSL v2 for more details.
***************************************************************************************/

#include <isa.h>
#include <cpu/cpu.h>
#include <readline/readline.h>
#include <readline/history.h>
#include "sdb.h"
#include <memory/paddr.h>
#include "/usr/local/c_learn/sy/ics2023/nemu/src/monitor/sdb/watchpoint.h"

static int is_batch_mode = false;

void init_regex();
void init_wp_pool();

/* We use the `readline' library to provide more flexibility to read from stdin. */
static char* rl_gets() {
  static char *line_read = NULL;

  if (line_read) {
    free(line_read);
    line_read = NULL;
  }

  line_read = readline("(nemu) ");

  if (line_read && *line_read) {
    add_history(line_read);
  }

  return line_read;
}

static int cmd_c(char *args) {
  cpu_exec(-1);
  return 0;
}


static int cmd_q(char *args) {
 printf("args->%c\n",*args);
  return -1;
}

/*调试*/
static int cmd_si(char * args){
 //printf("调试参数->%c\n",*args);
          cpu_exec((*args)-'0');	
	  return 0;
}

static void watch_point_display()
{
	int i;
	bool flag = true;
	for(i = 0; i< NR_WP; i++)
	{
		if(wp_pool[i].flag)
		{
			  printf("Watchpoint.No: %d, expr = \"%s\", old_value = %d, new_value = %d\n", 
		                 wp_pool[i].NO, wp_pool[i].expr,wp_pool[i].old_value, wp_pool[i].new_value);
			  flag = false;
		}
	}
	if(flag){
	  printf("No watchpoint now.\n");
	}
}

static int cmd_info(char *args) {
  if(!strcmp(args,"r"))
  {
    isa_reg_display();
  }
  else if(!strcmp(args,"w"))
  {
     watch_point_display();
  }  
  return 0;
}

static int cmd_x(char *args){
   char* n = strtok(args," ");
   char* baseaddr = strtok(NULL," ");
   int len = 0;paddr_t addr = 0;
   sscanf(n, "%d", &len);
   sscanf(baseaddr,"%x", &addr);
   for(int i = 0 ; i < len ; i ++)
  {
	 printf("%x\n",paddr_read(addr,4));//addr len
	 addr = addr + 4;
   }
	  return 0;
}

static int cmd_p(char *args){
     bool flag = false;
     printf("%d\n",expr(args, &flag));
     //assert(0);
     return 0;	
}

static int cmd_w(char *args){
      WP * wp =  new_wp();    
      strcpy(wp->expr,args);
      bool flag = false;
      int tmp = expr(args,&flag);
      if(flag)
      {
	      wp->new_value = tmp;
      }
      else
      {
	      printf("创建watchpoint的时候expr求值出现问题\n");
      }
       printf("Create watchpoint No.%d success.\n", wp->NO);
      return 0;	      
}

static int cmd_d(char *args)
{
      int i;
      int res = atoi(args);
      for(i = 0; i < NR_WP; i++)
      {
      if(wp_pool[i].NO == res)
        {  
                free_wp(&wp_pool[i]);
        }
      }
      return 0;
}


static int cmd_help(char *args);

static struct {
  const char *name;
  const char *description;
  int (*handler) (char *);
} cmd_table [] = {
  { "help", "Display information about all supported commands", cmd_help },
  { "c", "Continue the execution of the program", cmd_c },
  { "q", "Exit NEMU", cmd_q },
  { "si", "Debug", cmd_si},
  { "info","printf info",cmd_info},
  { "x","N EXPR", cmd_x },
  { "p", "exper", cmd_p },
  { "w", "watch point", cmd_w},
  { "d", "delete breakpoint", cmd_d }
  /* TODO: Add more commands */
  
};

#define NR_CMD ARRLEN(cmd_table)

static int cmd_help(char *args) {
  /* extract the first argument */
  char *arg = strtok(NULL, " ");
  int i;

  if (arg == NULL) {
    /* no argument given */
    for (i = 0; i < NR_CMD; i ++) {
      printf("%s - %s\n", cmd_table[i].name, cmd_table[i].description);
    }
  }
  else {
    for (i = 0; i < NR_CMD; i ++) {
      if (strcmp(arg, cmd_table[i].name) == 0) {
        printf("%s - %s\n", cmd_table[i].name, cmd_table[i].description);
        return 0;
      }
    }
    printf("Unknown command '%s'\n", arg);
  }
  return 0;
}

void sdb_set_batch_mode() {
  is_batch_mode = true;
}

void sdb_mainloop() {
  if (is_batch_mode) {
    cmd_c(NULL);
    return;
  }

  for (char *str; (str = rl_gets()) != NULL; ) {
    char *str_end = str + strlen(str);

    /* extract the first token as the command */
    char *cmd = strtok(str, " ");
    if (cmd == NULL) { continue; }

    /* treat the remaining string as the arguments,
     * which may need further parsing
     */
    char *args = cmd + strlen(cmd) + 1;
    if (args >= str_end) {
      args = NULL;
    }

#ifdef CONFIG_DEVICE
    extern void sdl_clear_event_queue();
    sdl_clear_event_queue();
#endif

    int i;
    for (i = 0; i < NR_CMD; i ++) {
      if (strcmp(cmd, cmd_table[i].name) == 0) {
        if (cmd_table[i].handler(args) < 0) { return; }
        break;
      }
    }

    if (i == NR_CMD) { printf("Unknown command '%s'\n", cmd); }
  }
}

void init_sdb() {
  /* Compile the regular expressions. */
  init_regex();

  /* Initialize the watchpoint pool. */
  init_wp_pool();
}
